Fusion (v. t.) : The act or operation of melting or rendering fluid by
heat; the act of melting together; as, the fusion of metals.
Fusion (v. t.) : The state of being melted or dissolved by heat; a state of fluidity or flowing in consequence of heat; as, metals in fusion.
Fusion (v. t.) : The union or blending together of things, as, melted together.
Fusion (v. t.) : The union, or binding together, of adjacent parts or tissues.